Skeletal records of bleaching reveal different thermal thresholds of Pacific coral reef assemblages
Skeletal records of bleaching reveal different thermal thresholds of Pacific coral reef assemblages
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白化的骨骼记录揭示了太平洋珊瑚礁组合的不同热阈值
DOI：
10.1007/s00338-019-01803-x
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发表时间：
2019
期刊：
影响因子：
3.5
通讯作者：
Mangubhai, Sangeeta
中科院分区：
文献类型：
--
作者：
Mollica, Nathaniel R.;Cohen, Anne L.;Alpert, Alice E.;Barkley, Hannah C.;Brainard, Russell E.;Carilli, Jessica E.;DeCarlo, Thomas M.;Drenkard, Elizabeth J.;Lohmann, Pat;Mangubhai, Sangeeta
海洋变暖正在对珊瑚礁生态系统产生负面影响，目前正在投入相当大的努力来预测世纪气候变化下的珊瑚礁未来。这些预测的一个限制因素是缺乏关于不同珊瑚礁群落的热阈值的定量数据，这在很大程度上是由于漂白观测的空间和时间差距。在这里，我们应用珊瑚漂白代理，骨骼应力带，重建漂白的历史，在赤道太平洋中部（CEP）的8个珊瑚礁，并使用这些信息来约束他们的珊瑚群落的热阈值。首先，三个属的大规模珊瑚收集在太平洋和加勒比海珊瑚礁的比例之间的校准，形成应力带在漂白事件，和总的观察到的漂白发生率在混合珊瑚类群的社区。相关性非常显著，表明块状珊瑚的应力带反映了群落水平漂白的严重程度（R2= 0.945，p < 0.001）。 我们将校准应用于八个太平洋珊瑚礁的应力带记录，重建了它们在1982年至2015年期间的漂白历史。开发并应用了CEP生物礁热应力（加热周数）估算方法。比较每个珊瑚群落在每个事件中经历的热应力水平与重建的漂白反应，我们表征了每个珊瑚群落的热敏感性，并量化了50%的珊瑚群落漂白的热阈值（B½）。我们的分析揭示了每个珊瑚礁独特的非线性热响应曲线。研究中最耐热的珊瑚礁（贾维斯和坎顿群岛）在比研究中最不耐热的珊瑚礁（马亚纳岛）高7到9倍的热应力下经历了50%的漂白。 对热耐受性的潜在驱动因素的探索揭示了b ½与每个珊瑚礁系统中热应力事件的历史之间的强烈相关性。耐热性也与溶解无机硝酸盐在水柱中的浓度和估计的珊瑚精力充沛的储备。
Ocean warming is negatively impacting coral reef ecosystems and considerable effort is currently invested in projecting coral reef futures under 21st century climate change. A limiting factor in these projections is lack of quantitative data on the thermal thresholds of different reef communities, due in large part to spatial and temporal gaps in bleaching observations. Here we apply a coral bleaching proxy, skeletal stress bands, to reconstruct the history of bleaching on eight coral reefs in the central equatorial Pacific (CEP) and use this information to constrain the thermal thresholds of their coral communities. First, three genera of massive corals collected on both Pacific and Caribbean reefs are used to derive a calibration between the proportion of corals that form stress bands during a bleaching event, and the total observed bleaching incidence in the community of mixed coral taxa. The correlation is highly significant, indicating that stress bands in massive corals reflect community-level bleaching severity (R2= 0.945,p< 0.001). We applied the calibration to stress band records from eight Pacific reefs, reconstructing their bleaching histories over the period 1982 to 2015. A percentile-based method of estimating thermal stress (Degree Heating Weeks) for CEP reefs was developed and applied. Comparing the level of thermal stress experienced by each coral community during each event with the reconstructed bleaching response, we characterized the thermal sensitivities of each reef community and quantified the thermal threshold (b½) at which 50% of the coral community bleached. Our analysis reveals a unique non-linear thermal response curve for each reef. The most thermally tolerant reefs in the study (Jarvis and Kanton Islands) experienced 50% bleaching at seven to nine times more thermal stress than did the least resistant reef in the study (Maiana Island). An exploration of the potential drivers of thermal tolerance revealed a strong correlation betweenb½and the history of thermal stress events in each reef system. Thermal tolerance was also correlated with concentrations of dissolved inorganic nitrate in the water column and with estimates of coral energetic reserve.
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佛罗里达群岛的珊瑚礁和布莱克高原的深海珊瑚的氧和碳同位素生长记录
影响因子：
56.9
作者：
C. Emiliani;J. H. Hudson;E. Shinn;R. George
通讯作者：
R. George
影响因子：
3.5
作者：
J. Mallela;S. Hetzinger;J. Halfar
通讯作者：
J. Mallela;S. Hetzinger;J. Halfar
DOI：
10.1016/0022-0981(92)90261-8
发表时间：
1992-01-01
影响因子：
2
作者：
BARNES, DJ;LOUGH, JM
通讯作者：
LOUGH, JM
影响因子：
2.4
作者：
COLES, SL;JOKIEL, PL
通讯作者：
JOKIEL, PL
DOI：
10.1016/0273-1177(95)00396-v
发表时间：
1995-01-01
期刊：
SATELLITE MONITORING OF THE EARTH'S SURFACE AND ATMOSPHERE
影响因子：
--
作者：
GLEESON, MW;STRONG, AE
通讯作者：
STRONG, AE